如何設置這種情況下，取決於是否規則

Question

如果我下面

$x = "go"; 
$y = "went"; 
$z "gone"; 

，我需要設置標題，其中標題是

$title = $x;    //only if "y" empty no care about "z" if empty or not 
$title = $x . " - " . $y; // if "y" not empty and "z" is empty 
$title = $y . " - " . $z; // if "z" not empty and "y" not empty 

這是我的嘗試，但外地和/或看起來很透氣（我是noob）

$empty = ""; // i've creaty empty example 
$x = "go"; 
$y = "went"; 
$z "gone"; 

if ($y==$empty) { 
$title = $x; // output should be go 

} else if($y!=$empty && $z==$empty) { 
$title = $x . " - " . $y; // output should be go - went 

} else if($y!=$empty && $z!=$empty) { 
$title = $y . " - " . $z; // output should be went - gone 

} else { 
$title = $x; // output should be go 
} 

有沒有人有更好的建議！非常感謝

Answer 1

$title = empty($y) ? $x : (empty($z) ? $x."-".$y : $y."-".$z);